Phys. Rev. Lett. 99, 257202 (2007) [4 pages]Thermodynamics of Carrier-Mediated Magnetism in SemiconductorsReceived 21 May 2007; published 21 December 2007 We propose a model of carrier-mediated ferromagnetism in semiconductors that accounts for the temperature dependence of the carriers. The model permits analysis of the thermodynamic stability of competing magnetic states, opening the door to the construction of magnetic phase diagrams. As an example, we analyze the stability of a possible reentrant ferromagnetic semiconductor, in which increasing temperature leads to an increased carrier density such that the enhanced exchange coupling between magnetic impurities results in the onset of ferromagnetism as temperature is raised. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.257202
DOI:
10.1103/PhysRevLett.99.257202
PACS:
75.50.Pp, 75.10.Lp, 75.30.Hx
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